Large eddy simulations of spray combustion instability in an aero-engine combustor at elevated temperature and pressure

Cheng, Yuzhou; Jin, Tai; Luo, Kun; Li, Zongyan; Wang, Haiou; Fan, Jianren

doi:10.1016/j.ast.2020.106329

Cited by 39 publications

(5 citation statements)

References 49 publications

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“…Large eddy simulation has been widely used in CFD, which can predict the unsteady combustion process with good accuracy. 31 The filtered governing equations can be expressed as:…”

Section: Numerical Approachesmentioning

confidence: 99%

Investigation on flame dynamic characteristics to air-inlet excitation in a gas turbine model combustor

Zhang

Liu

Zheng

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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The combustion characteristics for a gas turbine (GT) model combustor in air-inlet excitation are studied by Large Eddy Simulation (LES). Time series of heat release rate (HRR) fluctuation is captured during simulation. The precessing vortex core (PVC) structure is shown by pressure iso-surface, and the single/double helix branches of PVC alternately evolve in one forcing cycle. With the rotation of PVC, the high-speed ring zone (HSRZ) is periodically squeezed, and large-scale vortex roll-up results from that. The flame root structure is also significantly affected by PVC, which is one of the reasons for the HRR fluctuation. With the increase of the forcing amplitude, the flame response is divided into three parts. The linear growth zone and secondary rising zone are separated by saturation plateau. The flame dynamics analysis shows that the change of the flame structures and flame front oscillation modes are the apparent mechanism of the nonlinear flame response appearance.

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“…Large eddy simulation has been widely used in CFD, which can predict the unsteady combustion process with good accuracy. 31 The filtered governing equations can be expressed as:…”

Section: Numerical Approachesmentioning

confidence: 99%

Investigation on flame dynamic characteristics to air-inlet excitation in a gas turbine model combustor

Zhang

Liu

Zheng

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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show abstract

“…With the increasing performance requirements of combustion chambers and increasingly stringent emission regulations [1][2][3][4], gas turbine combustion chambers are required to operate at high temperature and high pressure [5][6][7][8][9], which usually leads to the occurrence of combustion instability [10][11][12][13][14][15][16][17]. The combustion instability phenomenon will be accompanied by pressure pulsation and exothermic pulsation in the flow field inside the combustion chamber [18][19][20][21], which leads to vibration of the combustion chamber components and affects the safe operation of the engine [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Impact of Oxygen Content on Flame Dynamics in a Non-Premixed Gas Turbine Model Combustor

Chen,

Huang,

Wang

et al. 2024

JMSE

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In this study, large eddy simulation (LES) was used to investigate the dynamic characteristics of diffusion flames in a swirl combustion chamber at an oxygen content of 11–23 wt% and temperature of 770 K. The proper orthogonal decomposition (POD) method was employed to obtain flame dynamic modes. The results indicate that oxygen content has a significant impact on the downstream flow and flame combustion characteristics of the swirl combustion chamber. With oxygen content increasing, the size of the recirculation zone is reduced, and the flame field fluctuations are intensified. The pressure and heat release fluctuations under different oxygen contents were analyzed using frequency spectrum analysis. Finally, the flame modes were analyzed using the POD method, and it was found that the coherent structures are asymmetric relative to the local coordinate system. At an oxygen content of 11 wt%, they exhibit larger coherent structures, while at an oxygen content of 23 wt%, they exhibit numerous turbulent structures.

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“…7,10 There are quite a few previous studies that investigated combustion instability under elevated pressure operation, especially in the engine's combustion-chamber-like environments. Cheng et al 11 investigated mechanisms of spray combustion instability in a high-pressure vessel and revealed the importance of the evaporation process for spray combustion instability. The droplet diameter and cooling air heavily dominate the oscillation amplitudes of spray flames.…”

Section: Introductionmentioning

confidence: 99%

Assessing the effects of pressure variations on combustion dynamics in vortex-tube flows

Ren,

Tian,

Jones

2024

Physics of Fluids

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In our investigation, we scrutinize combustion stability in vortex-tube combustion at high operating pressures by examining stability limits, flame configurations, and pressure oscillations. Our examination deeply probes the intricacies of flow and flame behaviors in terms of aerodynamic, thermodynamic, and flamedynamic aspects to identify the fundamental reasons behind stability variances at different pressure levels. The findings indicate that combustion instability escalates with rising operating pressures, marked by increased variability in flame patterns and a monotonic upsurge in pressure oscillation amplitudes. Although aerodynamic and thermodynamic stabilities remain unaffected, the thermoacoustic stability is compromised at elevated pressures. This is evidenced by the strong link between the Rayleigh criterion and the amplitude of pressure fluctuations, with an increased “gain” in the flame transfer function as pressure mounts. The core of the observed thermoacoustic instability is traced back to heightened density variations and mean flow velocities at high pressures, leading to amplified momentum flux oscillations.

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Large eddy simulations of spray combustion instability in an aero-engine combustor at elevated temperature and pressure

Cited by 39 publications

References 49 publications

Investigation on flame dynamic characteristics to air-inlet excitation in a gas turbine model combustor

Investigation on flame dynamic characteristics to air-inlet excitation in a gas turbine model combustor

Impact of Oxygen Content on Flame Dynamics in a Non-Premixed Gas Turbine Model Combustor

Assessing the effects of pressure variations on combustion dynamics in vortex-tube flows

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